20 
March. In the accompanying letter he remarks that they presents 
the same appearance then as in the November and December prej 
ceding, his Attention having first been called to them at that time: 
On°the 10th of April, I visited Cuba, and carefully examined th 
damaged wheat fields. At this time the larvae were abundant a. 
the bases of the stalks, all apparently full-grown, being of nearl 
uniform size; but no other forms were detected. 
Tjarvae continued to occur in the wheat at Normal, Cuba an 
Decatur as late as May 15, but on the 28d of that month non 
could be found after long continued search m fields which had pre 
viously been seriously infested by them. 
The worms of the second brood first appeared in our collector 
on the 26th of June, at which time they occurred m stalks ot wbe> 
and rye iust above the upper joint, m fields ncai Warsaw, 
western Illinois. By Prof. Riley, they have been found near S 
Louis as early as the middle of June, and by Mr. Lmtner, in Ne 
York, as late as “about the 1st of August. 
Pupa. The pupa was first obtained by us on the 12tli of Apr 
in some wheat sent from Centralia, Illinois, a few of the lan 
occurring at the same time. On the 30th of April, a pupanu, 
which had formed from the larva? obtained at Cuba was open 
and found to contain a pupa apparently on the point o erne: 
ing; but careful search m the field on the 23d of May show 
that all of this first brood had transformed to the fly at this dal 
Bv Prof. Riley, the pupal stage of the second brood is said to li 
from twelve to fourteen days; and Prof. Lmtner found the wsfj 
still in this stage about August 1. 
Imaao. I transferred from the infested field at Cuba, a lai 
number of the plants containing the larvie, and placed them 
breeding cages at the Laboratory on the 10th of April, for the pi 
pose of rearing the perfect insect. In order to a certain identifi 
tion of the fly, pieces of stems of wheat containing the larvae I 
isolated in small vials, and kept until the latter transformed. 1 
first adult emerged in one of these vials on the 4th ot May, c 
others continued to appear in the bottles and breeding cages 
frequent intervals until June 1, on which date a larva or pi 
obtained May 15 from Cuba, Ill., emerged as an imago. 
The first specimens of the imago collected in the open air v 
obtained by sweeping strawberry iields on the 28d of May at wP 
date careful search of wheat fields previously infested showed 
larvae or pupae, but numerous adults. On the 24th of May, a m 
her of adults were found in sweeping wheat at Normal, ana a s| 
few in meadows containing June grass and timothy. I 
Careful sweepings made in a variety of situations on the 15til 
June, at Normal, yielded none of the adults, neither could 
be found on the 26th of June at Warsaw, in western Illinois 
fields where the larvae of the second brood at that time occur 
Clover meadows and other situations adjacent to these infested he 
were carefully swept for adults, but none were obtained. At 
seyville and Alton, it was likewise impossible to find them, aitho 
evidence of the work of the larvae was not uncommon. 
